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IPS-2101h User Manual
20
7. Passing Through the NAT/Firewall
When IPS-2101h works with NAT/Firewall, some of the following cases might happen:
1. With a valid account, IPS-2101h can not successfully register to the server.
2. IPS-2101h itself can make calls but is not able to receive calls.
3. One-way talk. One end can not hear any sound.
It might be the NAT/Firewall issues in these cases. IPS-2101h supports two methods to allow
SIP passing through the NAT/Firewall by deploying STUN or Outbound Proxy.
7.1 SIP with STUN
z Service address：Enter the IP address or domain name of the SIP Proxy server.
z NAT traversal：Select “STUN” from the drop down list.
z NAT addr：Enter the IP address or domain name of the STUN server.
7.2 SIP with Outbound Proxy
z Service Address: Enter the IP address or domain name of the Outbound Proxy server. If
the port of the Outbound Proxy is not 5060, please add “:” and the port number right after
the Proxy server IP address.
z Service ID：Enter the IP address or domain name of the SIP Proxy server.
z NAT traversal：Select “Disable”.